SUMMARY

After updating my arch linux I found that the power buttons and restart buttons are gone from the bottom left corner of the fullscreen application dashboard, leaving aside their dear friend logout button. However I do see all the power buttons in the confirm exit dialogue box, after clicking the log out button. So from there, I'm able to shutdown and restart my PC for now. 

I did try restoring the missing buttons, but they all worked as a temporary fix. 
At first I tried deleting the old instance of the "app dashboard" widget from the dock and add a fresh new instance of it. Later I tried adding the missing buttons from the "power/session" category. This all worked for the current session and restarting the computer yet again makes our login button isolated. Poor login button! :(


STEPS TO REPRODUCE

I know this is going to be very difficult but I'm not really sure about the steps to reproduce this bug. The only thing that I did was updated my arch linux and after a restart, I noticed that the buttons are gone.


OBSERVED RESULT

The login button is isolated at the button left corner of the app dashboard.


EXPECTED RESULT

Should be with their pals shutdown and restart buttons.


SOFTWARE/OS VERSIONS

KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1